Hi there,
If you want to be a pilot then go for it. However, make sure you have a back up plan, and you can get your self the income you require from another industry sector if you need it.
Generally, a newbie CPL FI will not get any where near that amount of money. The problem is it can occasionally happen, as it did with me. I fell into an Instructors position at a shool who had just had two people leave. In the first year I worked myself hard and made £35000 and the second year pulled in £44000.
A realistic first year salary for a new FI is 18000 - 20000 if you work hard and are willing to travel.
Good luck